I am trying to graph the following surfaces so that they are all visible in the same place: z = y^2 - y^3
z == y^2 - y^3
on -3.5 < x < 3.5, -2 < y < 2, -3 < z < 3
(x-3)^2 + y^2 == 0.25
(x-3)^2 + y^2 = 0.25 on -3.5 < x < 3.5, -2 < y < 2, -3 < z < 0
(x+3)^2 + y^2 == 0.25
(x+3)^2 + y^2 = 0.25 on -3.5 < x < 3.5, -2 < y < 2, -3 < z < 0
How can I graph these three functions on these different intervals?